A simple, deployable, dev server for Polymer 3 web components
Last updated 2 years ago by azariah001 .
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$ cnpm install polyserve-deployable 
SYNC missed versions from official npm registry.


A fork of the polyserve scripts with the singular purpose of making it possible to directly deploy Polymer apps without building client side code separate from your server side.


$ npm install polyserve-deployable


Import polyserve-deployable

//* app.js
const polyserveDeployable = require('polyserve-deployable');
const path = require('path');
const send = require("send");

// see options listed below for more configuration options, all existing polyserve options are supported.
const options = {
  moduleResolution: "node",
  npm: true,
  assetPaths: [ // config for polymer starter kit follows: note assetPaths defaults to '/*' as per standard polyserve defaults if not defined.
/* It is possible to just do the '/node_modules/@*' asset path and serve the rest of your site assets
 * through the standard express app.use method for those who want a little bit more control.
 * Also note that trailing '/@*' this ensures you're only serving client side modules from '@polymer/' & '@webcomponents/',
 * there are a handful of other @ directories in the starter kit, if you're paranoid do two separate routes,
 * that's the whole point, configurable AF.

polyserveDeployable.startServers(options).then((server) => {
  console.log("polyserve-deployable loaded and ready");

  const { app } = server;
  // initilise any other express middleware you wish to use here

  /* serve your root app file: in this instance we're using the polymer-starter-kit as our example
   * so this file is in the root directory and is a html file. You can serve this from anywhere in the project structure
   * and utilise any server side rendering template engines you prefer using `app.render`.
  app.get('/', (req, res) => {
    res.sendFile(path.join(__dirname + '/index.html'));
  // include any other express routes here

}).catch((e) => {

Note that under the standard polyserve library you can do this import process, however, it always served '/*' making it possible to access virtually every file in the root which is not good.

So I've modified the app.get('/*', ...) declaration in the getApp() function in start_server.ts to accept an array of paths which still defaults to just [ '/*' ]. But now it can be overridden with any combination of paths with the only caveat being that it's a 1/1 between the file path from the project root and the express path;

So '/node_modules/@*' entry in the array is located at ./node_modules/ in the project folder structure and serves as example.com/node_modules/@* in express. Again note the @ this ensures only client side libraries escape the server. Although again if you're still not comfortable with this you can explicitly expand this to two entries of '/node_modules/@polymer/*' and '/node_modules/@webcomponents/*' in the array, yay configurable!

View server

The port defaults to 8081 unless that port is occupied in which case behaviour is the same as polyserve it will keep trying ports until it finds an unused one. Alternatively define port: '' in your options object to set the port manually.

Navigate to localhost:8081/ to view your served app or configure your proxy to access this route.


  • --version: Print version info.
  • --root string: The root directory of your project. Defaults to the current working directory.
  • --compile string: Compiler options. Valid values are "auto", "always" and "never". "auto" compiles JavaScript to ES5 for browsers that don't fully support ES6.
  • --module-resolution string: Algorithm to use for resolving module specifiers in import and export statements when rewriting them to be web-compatible. Valid values are "none" and "node". "none" disables module specifier rewriting. "node" uses Node.js resolution to find modules.
  • --compile-cache number: Maximum size in bytes (actually, UTF-8 characters) of the cache used to store results for JavaScript compilation. Cache size includes the uncompiled and compiled file content lengths. Defaults to 52428800 (50MB).
  • -p, --port number: The port to serve from. Serve will choose an open port for you by default.
  • -H, --hostname string: The hostname to serve from. Defaults to localhost.
  • -c, --component-dir string: The component directory to use. Defaults to reading from the Bower config (usually bower_components/).
  • -u, --component-url string: The component url to use. Defaults to reading from the Bower config (usually bower_components/).
  • -n, --package-name string: The package name to use for the root directory. Defaults to reading from bower.json.
  • --npm: Sets npm mode: component directory is "node_modules" and the package name is read from package.json
  • -o, --open: The page to open in the default browser on startup.
  • -b, --browser string[]: The browser(s) to open with when using the --open option. Defaults to your default web browser.
  • --open-path string: The URL path to open when using the --open option. Defaults to "index.html".
  • -P, --protocol string: The server protocol to use {h2, https/1.1, http/1.1}. Defaults to "http/1.1".
  • --key string: Path to TLS certificate private key file for https. Defaults to "key.pem".
  • --cert string: Path to TLS certificate file for https. Defaults to "cert.pem".
  • --manifest string: Path to HTTP/2 Push Manifest.
  • --proxy-path string: Top-level path that should be redirected to the proxy-target. E.g. api/v1 when you want to redirect all requests of https://localhost/api/v1/.
  • --proxy-target string: Host URL to proxy to, for example https://myredirect:8080/foo.
  • --help: Shows this help message

Run Tests

$ npm test

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